 # Addition to 1,000 crossing tens

Students learn to add to 1,000 crossing multiples of ten.

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## General

In this lesson students learn to add numbers up to 1,000 crossing multiples of ten.

## Standards

CCSS.Math.Content.2.NBT.B.7

## Learning objective

Students will be able to add numbers to 1,000 crossing multiples of ten.

## Introduction

Together with students, build an addition problem to 1,000 using MAB blocks and discuss the problem.

## Development

Check that students are able to add numbers to 1,000 crossing tens by asking the following questions:
- Why is it useful to be able to add to 1,000?
- What are different ways to add two numbers together?

## Guided Practice

Students are given various addition problems that include problems with visual support, abstract problems, and story problems.

## Closing

Discuss with students that it is important to be able to add to 1,000 crossing multiples of ten so that you can find the total. Show the blocks on the interactive whiteboard and ask students to determine which problem matches the blocks. Then determine the total. Give students a few more problems to solve, including a story problem and ask students to explain their strategy for the problems.

## Teaching tips

Students who have difficulty adding and crossing multiples of ten can be supported by making use of manipulatives like MAB Blocks or making use of the number line. Show students that they can make jumps in addition in different ways, and show how they are represented on the number line. Start with simple addition problems that cross tens like 153 + 9. Then as students become more comfortable, introduce problems like 118 + 25 and 367 + 127.

## Instruction materials

Optional: MAB blocks or other manipulatives.

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